RFR: 8365262: [IR-Framework] Add simple way to add cross-product of flags [v2]

[Manuel Hässig]

On Mon, 18 Aug 2025 08:12:02 GMT, Manuel Hässig <mhaessig at openjdk.org> wrote:

>> This PR adds the `TestFramework::addCrossProductScenarios` method to enable more ergonomic testing of the combination of all flag combinations. To illustrate its use, I also converted one test to use the new cross product functionality.
>> 
>> Testing:
>>  - [x] Github Actions
>>  - [x] tier1,tier2 plus some internal testing on Oracle supported platforms
>
> Manuel Hässig has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Apply Benoît's suggestion
>   
>   Co-authored-by: Benoît Maillard <benoit.maillard at protonmail.com>

Thank you for looking at this @eme64. I made the testing a bit more robust and added a case for a pair of arguments.

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PR Comment: https://git.openjdk.org/jdk/pull/26762#issuecomment-3207275001